Accession Number : AD0480315

Title :   ERROR IN THE USE OF THE M1 GUNNER'S QUADRANT.

Descriptive Note : Staff memo.,

Corporate Author : HUMAN RESOURCES RESEARCH OFFICE GEORGE WASHINGTON UNIV ALEXANDRIA VA

Personal Author(s) : Bancroft,Charles A.

Report Date : JUN 1955

Pagination or Media Count : 9

Abstract : This study is an attempt to determine how much error the operator of an M1 gunner's quadrant makes (1) in measuring the elevation of a gun tube, (2) in laying the gun in elevation, and (3) in reading the scale of the quadrant. The tanks used were ten M48 phase IV tanks, nine having the gun tubes fixed at different positions, and the tenth having the gun tube free for adjustment of elevation. Each subject read a quadrant scale setting and measured the gun elevation in each of the first nine tanks. In the tenth tank each subject laid the gun tube ten times at the same elevation using the gunner's quadrant. A probable error of the nine elevation measurements and a probable error of the ten gun lays were computed for each subject. Then an average PE of elevation measurement was computed for each group of subjects, that is, for the experts and for the tank commanders. Likewise, an average PE of re-lay was computed for each group. The percentage of scale misreadings for each group was also calculated.

Descriptors :   (*FIRE CONTROL SYSTEMS, ERRORS), GUN DIRECTORS, ELEVATING GEAR, OPERATORS(PERSONNEL), TANKS(COMBAT VEHICLES), PERFORMANCE(HUMAN), GUNS

Subject Categories : Fire Control and Bombing Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE